Taken out of context Pura Batu Bolong cannot be considered ancient ruins for sure despite the hints suggesting eroded arches. But if you look at the nearby Tanah Lot, where the ruins are better distinguishable... then Pura Batu Bolong take a whole new meaning. Also on the last photo we see something like heavily eroded columns. Is this modern imitation? If not then this confirms that indeed we have a heavily eroded building of extreme antiquity.